Desktop calculator



FIG. 1 is a front, bottom, left side perspective view of a desktop calculator, showing my new design with the broken lines illustrating environmental subject matter which forms no part of the claimed design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a back elevational view thereof. 

The ornamental design for a desktop calculator, as shown and described. 